Certification : a document, which validates the genuineness and validity of something : (Labour Relations Official) acknowledgement given to a union or a bargaining unit

Certified Cheque : a tool of payment, which is accompanied by a guarantee, given by the bank, that the amount for which the cheque has been drawn is available with the bank

Certified Mail : a mail for which the postal department keeps the mailing and delivery records : The mailer can obtain a written confirmation on request.

Certified Public Accountant : a person who has been tested by the state and after testing has been declared as a certified accountant : Though different states have different rules and regulations, a person licensed by one state is acceptable in the other state.